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+--- Thread: Derive duotone "colours" from an existing photo (/Thread-Derive-duotone-colours-from-an-existing-photo)
Derive duotone "colours" from an existing photo - jrickards - 03-07-2018
I like the way this photo (https://www.flickr.com/photos/152818709@...d-public/) looks and would like to apply a similar style to other photos.
I realize that the photo has vignetting and softening but what I'm not clear on is how to take a black and white photo and map the range of grays to the same tones in this photo. This photo was converted to this style using an in-camera style which is why I don't really know how it was done in-camera.
Is it possible and if so, how might it be done?
Thanks,
Jules
RE: Derive duotone "colours" from an existing photo - Espermaschine - 03-07-2018
Well, cant you just do a duotone ?
Apply the image as a grayscale layermask to two different coloured layers...
The vignette effect was done by making a blurred duplicate of the duotoned image and blending it with the original via a vignette shaped layermask.
[attachment=1517]
RE: Derive duotone "colours" from an existing photo - rich2005 - 03-07-2018
If you do a colorcube analysis on your image, there are a good number of colours, nearly 17,000
see: https://i.imgur.com/MvKcy5h.jpg
I would try the g'mic plugin from http://www.gmic.eu and the color curves filter.
The interface looks like this https://i.imgur.com/mtSA5Xx.jpg
Using the HSV option and pulling the Saturation curve right down and adjusting the Value curve gets this https://i.imgur.com/wyqVQrp.jpg
Not as many colors as I would like but getting there: https://i.imgur.com/m0LSawF.jpg
RE: Derive duotone "colours" from an existing photo - Ofnuts - 03-07-2018
With just Color>Hue/Saturation:
- Click Master
- Decrease saturation a lot (-88 here)
- Possibly shift the Hue a bit
[attachment=1516]
RE: Derive duotone "colours" from an existing photo - jrickards - 03-07-2018
(03-07-2018, 08:49 PM)rich2005 Wrote: If you do a colorcube analysis on your image, there are a good number of colours, nearly 17,000
see: https://i.imgur.com/MvKcy5h.jpg
I would try the g'mic plugin from http://www.gmic.eu and the color curves filter.
The interface looks like this https://i.imgur.com/mtSA5Xx.jpg
Using the HSV option and pulling the Saturation curve right down and adjusting the Value curve gets this https://i.imgur.com/wyqVQrp.jpg
Not as many colors as I would like but getting there: https://i.imgur.com/m0LSawF.jpg
Ah, I assumed (because I hadn't analysed it) that it was simply a monochrome of 256 colours max but obviously not.
I'll try those methods you've listed.
Many thanks,
Jules
(03-07-2018, 08:55 PM)Ofnuts Wrote: With just Color>Hue/Saturation:
- Click Master
- Decrease saturation a lot (-88 here)
- Possibly shift the Hue a bit
Cool, nice transformation.
Thanks,
Jules
(03-07-2018, 08:43 PM)Espermaschine Wrote: Well, cant you just do a duotone ?
Apply the image as a grayscale layermask to two different coloured layers...
The vignette effect was done by making a blurred duplicate of the duotoned image and blending it with the original via a vignette shaped layermask.
First of all, I thought it was a duotone but apparently, it isn't. I tried to replicate the duotone colour in Darktable but it wasn't coming out very well.
You share an interesting technique, I'll give it a try, thanks.
Jules
RE: Derive duotone "colours" from an existing photo - Espermaschine - 03-07-2018
Isnt OP's example image some kind of (fake) HDR effect ?
All the detail that is visible seems kind of enhanced.
This guy has a ton of photo effects, maybe there is some kind of technique that fits the bill:
https://www.youtube.com/user/GimpTutorialChannel/videos